This release supports a much larger variety of hardware and multiprocessor systems than previous releases, thanks to updates of ACPI and APIC and ACPI interrupt routing support. Hammer volumes can now deduplicate volumes overnight in a batch process and during live operation. The 'hammer dedup-simulate' command can be used to estimate space savings for existing data. DragonFly now uses gcc 4.4 as the default system compiler, and is the first BSD to take that step. DragonFly now offers significant performance gains over previous releases, especially for machines using AHCI or implementing swapcache(8).

Thanks for the report: yes, FreeBSD seems to be more active with clang than the other BSDs but I don't follow much the other BSDs so I tend to give them the benefit of the doubt in such body-part-size type of claims.

One issue for a complete system was the lack of C++ compiler support: FreeBSD's devd and groff needed it. Now the big issue, that all the BSDs have to work on, is completely replacing libgcc (compiler_rt and libunwind) and libstdc++ (with libc++ and something else yet unwritten).